CN211352552U - LED lighting circuit with short-circuit protection function - Google Patents
LED lighting circuit with short-circuit protection function Download PDFInfo
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- CN211352552U CN211352552U CN202020260494.8U CN202020260494U CN211352552U CN 211352552 U CN211352552 U CN 211352552U CN 202020260494 U CN202020260494 U CN 202020260494U CN 211352552 U CN211352552 U CN 211352552U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses a LED lighting circuit with short-circuit protection function, including chip IC1, electric capacity C3, triode Q1, triode Q2 and MOS pipe Q3, electric capacity C3 and power VCC are connected to chip IC 1's input VIN, triode Q1's projecting pole and ground are connected to electric capacity C1's the other end, chip IC 1's output OUT connecting resistance R1 and LED light H, resistance R1's other end connecting resistance R2, electric capacity C2, triode Q2's projecting pole and MOS pipe Q3's grid, triode Q1's collecting electrode and triode Q2's base are connected to resistance R2's the other end. The utility model discloses LED lighting circuit with short-circuit protection function uses the original paper few, and is with low costs, and the protection is fast, can carry out short-circuit protection to the circuit under the condition that does not damage consumption components and parts such as fuse or circuit breaker, increases circuit factor of safety, protection LED lamp.
Description
Technical Field
The utility model relates to the field of lighting technology, specifically a LED lighting circuit with short-circuit protection function.
Background
Along with the continuous improvement of the living standard of people, electronic equipment becomes an indispensable part in life, and particularly, various household appliances bring great convenience to the life and work of people, and the electronic devices have higher requirements on the supply of electric energy. Especially in the technical field of LED illumination, the protection to the condition such as short circuit is very important, in case the load takes place the short circuit, can make the inside conduction current of LED increase rapidly, and then the heat dissipation capacity increases to burn out the LED lamp, cause great economic loss.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a LED lighting circuit with short-circuit protection function to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
an LED lighting circuit with short-circuit protection function comprises a chip IC1, a capacitor C3, a triode Q1, a triode Q2 and a MOS tube Q3, an input end VIN of the chip IC1 is connected with a capacitor C3 and a power supply VCC, the other end of the capacitor C1 is connected with an emitter of the triode Q1 and the ground, an output end OUT of the chip IC1 is connected with a resistor R1 and an LED illuminating lamp H, the other end of the resistor R1 is connected with an emitter of the resistor R2, a capacitor C2, an emitter of the triode Q2 and a gate of the MOS transistor Q3, the other end of the resistor R2 is connected with a collector of the triode Q1 and a base of the triode Q2, a collector of the triode Q2 is connected with a capacitor C1, a resistor R3 and a base of the triode Q1, an emitter of the triode Q1 is connected with the other end of the capacitor C1, the resistor R1 and the ground, the other end of the resistor R1 is connected with the other end of the resistor R1, the other end of the other.
As the preferred scheme of the utility model: the triode Q1 is an N-type triode.
As the preferred scheme of the utility model: the triode Q2 is a P-type triode.
As the preferred scheme of the utility model: the MOS transistor Q3 is a P-MOS transistor.
As the preferred scheme of the utility model: the chip IC1 is a three terminal regulator.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses LED lighting circuit with short-circuit protection function uses the original paper few, and is with low costs, and the protection is fast, can carry out short-circuit protection to the circuit under the condition that does not damage consumption components and parts such as fuse or circuit breaker, increases circuit factor of safety, protection LED lamp.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, an LED lighting circuit with short-circuit protection function includes a chip IC1, a capacitor C3, a transistor Q1, a transistor Q2, and a MOS transistor Q3, an input end VIN of the chip IC1 is connected with a capacitor C3 and a power supply VCC, the other end of the capacitor C1 is connected with an emitter of the triode Q1 and the ground, an output end OUT of the chip IC1 is connected with a resistor R1 and an LED illuminating lamp H, the other end of the resistor R1 is connected with an emitter of the resistor R2, a capacitor C2, an emitter of the triode Q2 and a gate of the MOS transistor Q3, the other end of the resistor R2 is connected with a collector of the triode Q1 and a base of the triode Q2, a collector of the triode Q2 is connected with a capacitor C1, a resistor R3 and a base of the triode Q1, an emitter of the triode Q1 is connected with the other end of the capacitor C1, the resistor R1 and the ground, the other end of the resistor R1 is connected with the other end of the resistor R1, the other end of the other.
The utility model discloses a theory of operation is: when VCC supplies power, after the voltage is stabilized by the three-terminal voltage stabilizer, the output voltage is transmitted to the resistor R1 and the LED lamp H, the resistor R1 provides a voltage higher than 2V for the Q3(MOSFET) to be conducted, normal power supply output is carried out, if the output end is short-circuited, the current flowing through the resistor R4 is increased instantly (within 50 ms), so that a conducting voltage higher than Q1(NPN triode) is generated at the two ends of R4, Q1 is conducted, the base voltage of Q2(PNP triode) is reduced after Q1 is conducted, so that Q2 is also conducted, when Q1 and Q2 are both conducted, the G pole voltage of Q3 is always kept below 1V, and Q3 is in a disconnected state, so that the output of a power supply is cut off, and the protection effect is achieved. The circuit formed by R1, Q2, and Q3 will always be on and will maintain Q3 off as long as the incoming power is present.
If the user removes the corresponding short-circuit fault and performs power-off restart on the product, the protection circuit formed by R1, Q2 and Q3 automatically fails, and Q3 is conducted to perform output power supply again.
3. Supplementary description of the function of the electronic original device in the circuit: r1 is Q3 and Q2, and Q1 is turned on or off to judge power supply; r2 provides bias voltage for Q2; r3 is C1 charge-discharge resistance; r4 is a detection resistor; q1 and Q2 form a self-locking voltage reduction circuit; q3 is MOS tube for switch; c1 is an interference reduction absorbing element; the load capacity of the circuit output can be changed by adjusting the parameters of R4 and Q3, the smaller the R4 is, the larger the current value of Q3 is, the larger the load current value is, and the load current is reduced.
Claims (5)
1. An LED lighting circuit with a short-circuit protection function comprises a chip IC1, a capacitor C3, a transistor Q1, a transistor Q2 and an MOS tube Q3, and is characterized in that an input end VIN of the chip IC1 is connected with the capacitor C3 and a power supply VCC, the other end of the capacitor C3 is connected with an emitter of the transistor Q3 and ground, an output end OUT of the chip IC 3 is connected with a resistor R3 and an LED illuminating lamp H, the other end of the resistor R3 is connected with the resistor R3, the capacitor C3, the emitter of the transistor Q3 and a gate of the MOS tube Q3, the other end of the resistor R3 is connected with a collector of the transistor Q3 and a base of the transistor Q3, the collector of the transistor Q3 is connected with the capacitor C3, the base of the resistor R3 and the base of the transistor Q3, the emitter of the transistor Q3 is connected with the other end of the capacitor C3, the other end of the resistor R3, the other end of the capacitor C3 and the source of the MOS tube Q, the drain electrode of the MOS tube Q3 is connected with the other end of the LED illuminating lamp H.
2. The LED lighting circuit with short-circuit protection function as claimed in claim 1, wherein the transistor Q1 is an N-type transistor.
3. The LED lighting circuit with short-circuit protection function as claimed in claim 1, wherein the transistor Q2 is a P-type transistor.
4. The LED lighting circuit with the short-circuit protection function according to claim 1, wherein the MOS transistor Q3 is a P-MOS transistor.
5. The LED lighting circuit with short-circuit protection function as claimed in claim 1, wherein the chip IC1 is a three-terminal regulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020260494.8U CN211352552U (en) | 2020-03-05 | 2020-03-05 | LED lighting circuit with short-circuit protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020260494.8U CN211352552U (en) | 2020-03-05 | 2020-03-05 | LED lighting circuit with short-circuit protection function |
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| Publication Number | Publication Date |
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| CN211352552U true CN211352552U (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020260494.8U Active CN211352552U (en) | 2020-03-05 | 2020-03-05 | LED lighting circuit with short-circuit protection function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112020180A (en) * | 2020-10-21 | 2020-12-01 | 佛山市迅盈电源科技有限公司 | PWM dimming circuit with current limiting and short-circuit protection functions and application circuit thereof |
-
2020
- 2020-03-05 CN CN202020260494.8U patent/CN211352552U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112020180A (en) * | 2020-10-21 | 2020-12-01 | 佛山市迅盈电源科技有限公司 | PWM dimming circuit with current limiting and short-circuit protection functions and application circuit thereof |
| CN112020180B (en) * | 2020-10-21 | 2021-02-05 | 佛山市迅盈电源科技有限公司 | PWM dimming circuit with current limiting and short-circuit protection functions and application circuit thereof |
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